installing theme on subdomain in a WPMU environment

I am using Gridmarket/Framemarket on my primary domain. shopbyera.com. It looks the way I want it. I want my network stores to use the same theme. I have network activated them in the primary account, yet they do not appear in the Appearance section of the subdomain. I have read several posts that suggested network activation and checking the permissions of the themes. Both 755. Could really use some direction on what I should try next. Thanks. John